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This is a place to share knowledge related to 1/12th scale racing. It is not to be used for conversations.

KITS:
Click links to go to manufacturer product page. If any are missing please add them!

TIRES:
Pre-mounted tires readily available in the US:
Pre-mounted tires readily available in the Europe:
  • Hot Race ??

Gluing your own donuts:
https://www.youtube.com/watch?v=hm7z1rz-74s - Special thanks to Edward Pickering!
Truing tires:
https://www.youtube.com/watch?v=8wqHOLWq6Uc - Special thanks to Edward Pickering!

The following information came from HERE, with some editing and information added. Thanks Christian!

THIS MAY NEED UPDATING FOR THE NEW BLACK CRC CARPET

Brands:
BSR, CRC, Jaco:
Pro One is no longer selling to the public, but it and the brands above are all mounted by BSR and use the same foam. The nomenclature of the BSR vs Jaco/CRC is a little different in a few instances but is otherwise the same. The BSR foam consists of three families, and can be identifed as synthetics, naturals, and blends.

Synthetics - The old school, light weight, easy to true "dry feeling" tires. These include tires like CRC/Jaco Yellow (BSR White), Black, Gray, etc. These tires offer the highest wear rate and lowest grip. Many racers continue to use these nder high bite conditions.

Naturals - These tires are usually the best alternative for low bite and asphalt. They include Pink, Magenta, Double Pink, Lilac (BSR Team Purple), Purple, and other tires. These tires provide a ton of grip, but tend to get sticky in high bite conditions. This rubber does not wear as easily, and the cars will pick up gunk and fibers from the carpet under most high bite conditions. This is especially bad if the humidity is high.

Blends - These are the tires most people run today. They were initially called "JFT foam" by some, as it was believed that the tires were the same as the JFT tires. We can divide the blends further into two groups: high rubber and low rubber content. The high rubber would be the new rear Orange and Red from the BSR family, and the low rubber would be the Green and Blue varieties. When, asked about the difference, John Foister from BSR Tires said they came from the same "family" of foam, but they offered different grip. According to John, the Green/Blue has more bite than Orange/Red, but from track testing Oranges offer more bite than Green (being equivalent to in hardness) when the grip is high and absolutely no grip when it is lower. The Orange foam has a denser pore structure and the tire is not as prone to chunking. It is also important to note is that BSR Blue rears are not the same as the BSR Blue fronts!

JFT:
JFT stands for Japan Foam Tire. They started the new wave of foam tires we are all using now (Blue/Blu, Green/Greene, Dbl Blue, etc). These tires are a little different than the BSR tire family, but work in very similar conditions. They offers four varieties A (asphalt), C (carpet), S (???), and R (???). This does not mean that those types only work on that surface, but this is what they recommend.

JFT uses the same foam for fronts and rears if the color is the same.

A: Used on asphalt, considered close to the natural rubber variety and are named consistently with other natural tires.
C: Used on carpet, considered a blend.
S: Used on carpet?, tires are ???
R: Used on carpet?, tires are ???

For setup, the JFT foam seem to generate more bite than the BSR, therefore the car tends to be a little more aggressive.

Ulti:
Ulti is another Japanese brand that offers an array of compounds. They have their own way of rating tires, and are difficult to equate to other brands. They have 4 different varieties, each in varying degrees of hardness.

J: High rubber content tire, similar to Pink/ Magenta. Soft would be close to a pink. These offer the most bite and are great for asphalt/carpet front tire. (J hard being very popular)
X: "Balanced" blend, similar to JFT Blue/ Green. Soft is equivalent to Green, medium to Blue in hardness. Great for carpet!
Y: High synthetic blend with lower grip, and is not a very popular variety.
Z: A very expensive "special" foam that is supposed to be magic on asphalt. Only make it in soft shore.
European tires:
There are many great European foam tire brands that use their own types of foam, as well as traditional foams. SOmeone with more knowledge about them will need to fill this in!

Tire Diameter:
If you are racing on carpet, you have to evaluate how much grip your track has. If your track is low to medium grip, you can run bigger tires. If you are on higher bite you have to cut them smaller, there is simply no way around it. Bigger tires are needed for asphalt, especially in the rear. The larger tires provide much needed lateral bite.

Carpet (mm):
Low - Medium Bite
Front: 42.0 - 42.5
Rear: 42.5 - 43.00
Medium - High Bite
Front: 40.5 - 41.0
Rear: 41.5 - 42.0
Big Race
Front: 39.5 - 40.0
Rear: 40.5 - 41.0
Asphalt (mm):
Parking Lot
Front: 43.0 - 44.0
Rear: 44.0 - 45.0
Prepped High Bite
Front: 42.0 - 43.0
Rear: 43.0 - 44.0

Tire Saucing:
Most facilities have moved towards odorless traction additives such as SXT. Some of additives evaporate very quickly and some do not. This seems to be something that is also dependent on tire compound and ambient temperature. For example, saucing a Green compound seems like it never dries, especially when tjhe temperature is lower. We have found that wiping the tires off 15 minutes before we go run allows the sauce to cure, which makes the car come in much quicker with Green rears. Blue compounds on the other hand, do fine when wiped off right before hitting the track.

Saucing half front and full rear is a good initial starting point. If the front of the car is too agressive you can sauce les than half, or for a shorter amount of time.
Tire Fuzzing:
In conditions of increasing grip, foam tires will somewtimes get sticky and pick up fuzz and debris from the track. This is highly dependent on the rubber sedan tire that is being run at your local track and the compound/ type of foam you are running on you car. The softer the sedan tire and the harder/higher rubber content in your foam tire, trouble with fuzzing seems more likely to occur.

There are ways to get around fuzzing under most conditions, and usually involves the selection of the correct foam compound. The more fuzz you get, the softer/lower rubber content you want to run.

Examples:
Problem: Car fuzzes with Lilac/Team Purple fronts and car starts pushing.
Solution: Use a softer front tire and or different family of foam. Replace it with Blue or Double Blue front.

Problem: Car loses rear bite 6 minutes into the run. Blue rear tires look almost clean but have small carpet hairs.
Solution: Use Green rear tires. The softer compound wears instead of getting sticky, minimizing fuzz.

Tire Selection:
Starting out, pick 2 tire compounds for the front and rear. The following should have you covered 99% of the time.

Front - Green and Blue (BSR) or Green and Light Blue (JFT)
Rear - Blue and Double Blue (BSR) or Blue and Dark Blue (JFT)

You may wonder about other compounds out there and if they might be better, trust me, they probably won't be. Even if there are other tires that can be as fast, the synthetic family wears out really fast and the high natural rubber will probably fuzz on you over an 8 minute run. The blends family seems to be the most versatile foam type available today. They last awhile, and sticking to them will make your process of tire selection simpler.
Tire Charts:
BSR/CRC/Jaco



Contact



Corally



JFT (Japan Foam Tire)



Ulti



Enneti (Xceed)



ELECTRONICS:
ESC:
As of now, ROAR is staying 1S (3.7V nominal; 4.2V fully charged) for 1/12. There are many 1S ESC's with a built in BEC so nothing else is required to power the receiver and servo.

If you don't want to lock yourself into a 1S specific ESC, you do have other options! It is possible to use your 2S ESC without a booster or receiver pack, and the ESC simply supplies the lower voltage. If that does not appeal to you, you will need to use an Rx pack or booster. The Rx pack and booster will both supply the receiver with a higher voltage than the 1S pack.

If you decide to use an Rx pack, MAKE SURE TO REMOVE THE RED WIRE FROM THE ESC PLUG THAT GOES INTO THE RECEIVER!!!

If you choose to use a voltage booster, it works exactly how it sounds. Instead of plugging the ESC into the receiver, it plugs into the booster, and the booster plug goes to the ESC, supplying the higher voltage.

1S ESC:
If there are any missing please add them!!

If anyone would like a need for a chart comparing the ESC's specs PM fenton06 and I'll get one made and put in here!
Voltage Boosters:
If there are any missing please add them!
Servos:
BODIES:
Black Art (CRC - US Dist):
  • Audi R8C - BA002 - .020 Thick



  • Black Market (Mohawk 12) - BA005 - .020



  • Lola B10 - BA006 - .020 thick
  • Toyota TS030 - BA008 - .020 thick

    Lola - black/red, TS030 - green/pink


PROTOForm:

Reflex Racing/RSD:

SUSPENSION ADJUSTMENTS:

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Old 01-30-2005, 05:51 PM   #10621
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Any of you guys know what kid of shock Hara was using on his Hammer???
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Old 01-30-2005, 05:58 PM   #10622
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Quote:
Originally posted by Chad_R40
Any of you guys know what kid of shock Hara was using on his Hammer???


looks like a regular 10th scale shocks to me.
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Old 01-30-2005, 05:58 PM   #10623
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Quote:
Originally posted by Chad_R40
Oh ok. Im goign to look for IRS website right now.
oh yeah.... hust to add my Threaded front axel snapped too.. like it was weak metal... anyone have this problem.
Which car??? I snapped the stock threaded that came with my CRC... Put the Lunsford Titanium and no more problems... Although I have a spare set just in case... the crappy thing is I had to chuck the nuckle cause I couldn't get the rest of the axel out....
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Old 01-30-2005, 06:03 PM   #10624
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Quote:
Originally posted by Chad_R40
Oh ok. Im goign to look for IRS website right now.
oh yeah.... hust to add my Threaded front axel snapped too.. like it was weak metal... anyone have this problem.
Chad,

I have a few extra IRS shocks. Just let me know and I can get one to ya for 10 bucks complete. I have 3 silver ones that I am not currently using that were just re-built.

I will be going to RcScrewZ tuesday to drop some stuff off. I will have one with me just in case you might be able come by and want one.

Tim
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Old 01-30-2005, 06:27 PM   #10625
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Oh hey Tim....You found me in the right place Sure i'll pick up one of those shocks off you, and you would not happen to have any front threaded axels would you? oh yeah i'll be at Screwz around 6:30 -7:00pm Tues..Damn night school...:-/
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Old 01-30-2005, 07:42 PM   #10626
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Hi All,

AdrianM said earlier to run front turnbuckles in the lower servo holes (and Adrian please feel free to answer this if you see it). This give a lot of Ackerman, the inside wheel really cranks over. Does this have a detrimental effect on handling (steering)? Please explain how. I understand that the wheel need to turn different amount to track the actual direction of the wheel, I'd like to understand the effect on handling.

Thanks all.

Chris.
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Old 01-30-2005, 08:27 PM   #10627
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Default Ackerman

Here is about the best description of Ackerman I've seen:
http://users.pandora.be/elvo/c3/index.htm
Go to the "Alignments" section.

I run holes furthest down, as Adrian describes, when running the servo flat. Don't worry to much about Ackerman. Just shim the outter ball studs and get rid of the bump steer.

take care
john
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Old 01-30-2005, 08:52 PM   #10628
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Thanks for posting a link to that site JohnB. There is so much information that i'll have to spend a day or two wrighting down notes and stuff.
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Old 01-30-2005, 09:23 PM   #10629
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Default axles

vtl1180ny - CRC has new steel axles now. We have just received them. With still little testing, we havent broken one yet. however they are definately way stronger, and have a nice black finish.

Also look for a new improved center shock to hit the market.
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Old 01-30-2005, 10:21 PM   #10630
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Thanks Johnb,

Has anyone tried different Ackerman angles on the track with a 12th? If so what happened? I like the idea of reducing Bump steer (but I'd like to know how that affects handling too).

Chris.
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Old 01-31-2005, 12:43 AM   #10631
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Default discharging...

Hey Guys,

new to 12th scale and I will be giving it a try in the next couple of weeks.....

question: I have had some battery packs and I need to cycle them before I loose them, but with my 6cell pack I use my integy 30amp discharger, but what you you all use for 4cell packs????

"Is it safe to use my Integy 30amp discharger????"

I need some experienced advice, please advise (a rookie....)
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Old 01-31-2005, 01:40 AM   #10632
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Quote:
Originally posted by Chad_R40
Oh ok. Im goign to look for IRS website right now.
oh yeah.... hust to add my Threaded front axel snapped too.. like it was weak metal... anyone have this problem.
With the 3.2r it's the anodising on the shock body causeing the problem !!

Just change that for an ass. std silver one and everything will be fixed
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Old 01-31-2005, 06:50 AM   #10633
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Default CRC center shock

Dayger...
What will be changed on the center shock??
Wayne
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Old 01-31-2005, 09:26 AM   #10634
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Default Shock

Hey Wayne...

You won't have to use that white star piece to hold the shock together anymore. There's going to be a threaded bottom, with a cap.
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Old 01-31-2005, 09:35 AM   #10635
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speaking of center shocks has anyone can up with a way to easly get it off to change batteries.

on my l4 i have to pop the shock every time i change batts

any suggestions

Rob
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